"Police officers are well trained to deal with such crimes and used high-tech systems to find the suspect. A total of 8,620 hours of footage recorded by surveillance cameras were analysed by the force."

Some 120 people working at the vehicle transfer company were questioned, police said.

"The suspect confessed stealing the diamond. According to his plan, the diamond would be placed in his boot and shipped with other items by sea," said Col Al Ahli.